Alan Stern wrote: >On Sun, 13 Aug 2006, Tony Smolar wrote: > > > >>Hi, >> I recently upgraded to Fedora Core 5, from an old Red Hat 9 >>installation, so I began using Linux 2.6 for the first time. I >>immediately started having USB problems. Ports that don't work, >>devices that stop working suddenly. I did searching of this list and >>found that cabling is often suspect. So I redid the cabling to my front >>USB ports. Now my front USB 2.0 ports work fine, but I'm still having >>trouble with a particular device. It's an internal 9-in-1 card >>reader. If you put a SD card in and read a few photos off of it, it's >>guaranteed to stop working with the following message under "dmesg": >> >>usb 6-3: reset high speed USB device using ehci_hcd and address 2 >> >>If I remove the ehci_hcd driver, it works fine with the ohci_hcd >>driver. I think the device is just not completely USB 2.0 >>compliant. It seems to flake out under Windows too. I suppose it >>still could be cabling, but it looks to have a good quality cable, and >>I've tried to isolate it from other sources as much as possible inside >>the case. The type of cable it uses isn't easy to come by, so I think >>I'm stuck with what I've got. >> >> > >It could a problem not so much with the cable itself as with the >termination electronics at the point where the cable joins the device. > > Hmm, that got me thinking... USB headers on motherboards usually come in pairs. I have two frontal ports + this card reader. The front ports are paired to a header, but the card reader is not paired with anything, could that cause termination problems? There's no way to configure termination on the device itself.
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